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Leases - Schedule of Company's Right-of-Use Asset (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Presentation of leases for lessee [abstract]        
Balance at beginning of the period   $ 1,382 [1] $ 1,797  
Additions   599 215  
Disposals   (112) (36)  
Depreciation $ (30) [2] (596) (555) [3] $ 0
Hyperinflationary economies effect   14 20  
Indexation effect   145 15  
Effects of changes in foreign exchange rates   (154) (74)  
Balance at end of the period $ 64 [4] $ 1,278 $ 1,382 [1] $ 1,797
[1] The Company initially adopted IFRS 16 on January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[2] Convenience translation to U.S. dollars ($) – See Note 2.2.3
[3] The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18
[4] Convenience translation to U.S. dollars ($) – See Note 2.2.3